I think you hit the main ones for card advantage, and I really like Mask of Memory because you are running Karmic Guide and Bruna, the Fading Light  ^Meld and you can sometimes pitch a big creature to get reanimated. I have a Bruna deck and it's very fun to reanimate in mono white : )

Other equips you might consider in general are: Dowsing Dagger  ^Flip is great with flyers, and pays back 3 of it's 4 mana often on the turn it comes down.

Hedgewitch's Mask I really like this one, especially with flying creatures to limit who can block them even more.

Explorer's Scope might just be my all time favorite equip, but it might just be me : ) Most often it is just a more efficient Wayfarer's Bauble and even if it bricks, it's surprisingly valuable to know your next draw and plan your plays before you draw.

And one I really like in angels is Concerted Effort It can turn Mother of Runes into boardwipe protection, or give your whole team double strike, or just make your support creatures flyers.

Oh, and also, equip decks can have a lot of fun with Leonin Shikari that can give all creatures Lightning Greaves or add on more Sword of Fire and Ice triggers, more Sword of the Animist triggers, it's always pretty good.

Ha, I missed the plot part on railway brawler, it does seem way more flexible than I thought : ) Seems fun!

I haven't played with Railway Brawler, and it seems good, but I'm not sure it's suited for every deck. It's a very powerful effect to add counters and double creatures power, but at 5 cmc, you probably won't be casting a creature right after railway brawler, and then it has to stick around until next turn. Maybe it's great with flash enablers? Flash it in before your turn and then go to town sounds pretty good.

I mean, I think it's a really good card, but it's much less powerful than something like Voja, Jaws of the Conclave just because Voja works with haste enablers to get the value end on the turn it comes down.

I feel like Railway Brawler could absolutely run away with games, but I feel like it could also just get hit by Swords to Plowshares just as much of the time.

I love the first two Mummy movies, and this is just a great reason to break out the DVDs that are around here somewhere : ) One of my favorite things of The Mummy and The Mummy Returns is that the main characters all really have chemistry together. Especially in the first movie, the love story is like, yeah I could really see these two falling for each other, and in the second movie the friendship of O'connel and Ardith Bay is super believable. Plus with Johnathan being a very good lovably jerk...yep, it's kinda awesome. They may not be perfect movies, but they might just be perfect casts for a Mummy movie.

Hmm, I think in general I'd say Rune-Scarred Demon is better, but in your deck you have a lot of interaction and a lot of cards that are good for specific situations, and I actually think Diabolic Revelation might be better to set up multiple plays, or get something to counter another player and something to further your board at the same time.

I almost hate to suggest it because it may be too mean, but what do you think about something like Overburden or Mana Breach to load up opponent's hands with lands? Expel from Orazca is a favorite card of mine and might also work, return a card you want to play with Sen, or if in ascend, then it's brutal because you remove a threat and screw up their next draw.

Also, there's no way it works, but Patron of the Moon doesn't work with Sen Triplets does it? It does say your hand, so I assume you can't play lands with patron from an opponent's hand, but maybe? It would just be a fun play to bounce lands back to their hand and then jam them out on your field. Doubt it works, but hey, the patron kami's will get their day!